Fitch, do you think it's overkill to use 2 balance beam scales. In otherwords measure powder on 1 scale and then transfer to 2nd scale to confirm?

What I think doesn't matter, it is what gives you confidence in the result that matters, and that will depend on what you have on your bench.

When I didn't have confidence in my scales and didn't know which one to trust, I used check weights to set them and then used more than one. Once I had figured out which one I could trust (the Ohaus 10-10 is the only trust worthy one of the three), I just use it and trickle to weight after setting it with the check weights.

Bottom line, check weights are the key to the process once one has confidence in the scale.

In appreciation of that little bit of wisdom, I ordered some scale check weights today. It is simply great having those with vastly more reloading time under their belts being willing to share their thoughts and personal experiences with us newbys. Thanks.